trtools: Miscellaneous Tools for Teaching Statistics

#' Change in carapace size of female dungeness crabs after molting. 
#'
#' Data collected from a study of the change in the carapace size of female dungeness crabs (\emph{Metacarcinus magister}) before and after molting. Crabs were either captured prior to molting and then allowed to molt in captivitiy, or were re-captured after being measured and tagged. See Nolan and Speed (2009) and Hankin et al. (1989) for details. 
#'
#' @format A data frame with 472 observations and four variables:
#' \describe{
#'    \item{presz:}{carapace size (mm) before molting}
#'    \item{postsz:}{carapace size (mm) after molting}
#'    \item{year:}{fishing season for captive crabs}
#'    \item{source:}{source of crab (re-capture or captive)}
#' }
#'
#' @source Nolan, D. & Speed, T. P. (2009). \emph{Stat Labs: Mathematical statistics through applications}. New York: Springer. See also the references cited therein.
#' 
#' Hankin, D. G., Diamond, N., Mohr, M. S., & Ianelli, J. (1989). Growth and reproductive dynamics of adult female Dungeness crabs (Cancer magister) in northern California. \emph{Journal du Conseil: ICES Journal of Marine Science}, \emph{46(1)}, 94--108.
"dungcrabs"